Sorry for not responding sooner, but I've found the following for services 177/178 in the October '76 Sunderland District booklet.
Old Bus Routes (Washington)
Old Bus Routes (Washington)
Old Bus Routes (Washington)
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by Washingtonian
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06 Jun 2020, 7:11 pm
Old Bus Routes (Washington)
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by cbma06
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07 Jun 2020, 7:28 am
RE: Old Bus Routes (Washington)
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by Washingtonian
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07 Jun 2020, 8:29 pm
RE: Old Bus Routes (Washington)
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by LVK 404L
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08 Jun 2020, 7:17 am
RE: Old Bus Routes (Washington)
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by Washingtonian
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08 Jun 2020, 9:49 pm
RE: Old Bus Routes (Washington)
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by Adrian
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09 Jun 2020, 3:43 pm
RE: Old Bus Routes (Washington)
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by Washingtonian
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10 Jun 2020, 12:21 pm
RE: Old Bus Routes (Washington)
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by Andreos1
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03 Feb 2022, 8:46 am
RE: Old Bus Routes (Washington)
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by ASX_Terranova
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26 Feb 2022, 9:07 pm
RE: Old Bus Routes (Washington)
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by stagecoachbusdepot
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09 Mar 2022, 12:20 am
RE: Old Bus Routes (Washington)
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by MurdnunoC
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09 Mar 2022, 7:20 am
RE: Old Bus Routes (Washington)
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by ASX_Terranova
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09 Mar 2022, 10:33 am